Philippine Standard Time

January 28, 2022






The Philippine Institute of Volcanology and Seismology (PHIVOLCS) hereby invites legally capable suppliers to submit bids for a negotiated procurement for the PHIVOLCS’ requirement for “Repair of RP Vehicle SFV 960”. The ABC is ₱78,000.00.

The opening of bids shall be on February 2, 2022, 1:30 PM at PHIVOLCS Bldg.C.P.Garcia Avenue, UP Campus, Diliman, Quezon City.


In view of this bidding, PHIVOLCS reserves the right to reject any or all bids and waive any formalities/informalities therein and to accept such bids it may consider as most advantageous to PHIVOLCS and to the government as well. PHIVOLCS neither assumes any obligation for whatsoever losses that may be incurred in the preparation or submission of bids nor does it guarantee that an award will be made.


Kindly submit your best offer with the following requirements:

- Mayor’s/Business Permit

- PHILGEPS Registration Number

- Omnibus Sworn Statement



       Chairperson, BAC


Teresito Bacolcol, Alfie Pelicano, Genesis Sapla, Zachary Albert Ragadio, Mary Lizeth Anero, Cassandra Joy Cabigan, and Alberto Baloto


Philippine Institute of Volcanology and Seismology (PHIVOLCS) PHIVOLCS Bldg. C.P. Garcia Avenue, University of the Philippines Campus, Diliman, Quezon City, 1101 Philippines




The long-term interseismic surficial velocities and horizontal displacements within the epicentral region of the October 2019 Cotabato earthquake series (M6.4 on 16 October 2019; M6.6 on 29 October 2019; and M6.5 on 31 October 2019) were determined using Global Positioning System (GPS) data gathered from campaign surveys conducted in Cotabato province. Processing of GPS campaign data culled between 2009 and 2018 showed surficial interseismic velocities ranging from 0.7 to 67 mm/yr, with azimuths from N270° to N296°, calculated with respect to the Eurasian plate. On the other hand, a combined co-seismic displacement of 334.99 mm was derived from GPS campaigns conducted three days after the 31 October 2019 M6.5 Cotabato earthquake. The direction of the displacements of the two GPS stations closest to the epicenters indicate a largely right-lateral strike-slip motion. This calculated displacement may be cumulative coseismic displacements of the three strong successive earthquake events.




This report to be cited as: Teresito Bacolcol, Alfie Pelicano, Genesis Sapla, Zachary Albert Ragadio, Mary Lizeth Anero, Cassandra Joy Cabigan, and Alberto Baloto. 2021. Interseismic Surficial Velocities and GPS Motions Associated with the October 2019 Cotabato Earthquake Series. PHIVOLCS Open-File Report No. 21-01, 8 pages.


[Download full text]